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gage block

noun
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Definition of gage block

: a hardened steel block that is used by machinists for extremely accurate measurement and has two opposite surfaces ground and lapped plane and parallel to a thickness within a few millionths of an inch of its designated size and usually forms one of a graduated set of which two or more are often used in combination

— called also precision block, size block

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“Gage block.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/gage%20block. Accessed 27 Feb. 2021.

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